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Neekman99
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Yes sorry, was attempting to figure out how to upload the image after I posted it :D Have added it now.berkeman said:Can you upload a sketch? It's hard to picture what you are describing. Use the Upload button in the lower right of the Edit window to attach a PDF or JPEG file to a post here at the PF. Thanks.
The actuator needs to remain parallel to the right side of the stand, so would use something like a standard prismatic joint but with the net upward force the friction would mean there is a large resistance to the horizontal motion. Do you know of any way to reduce this resistance for this joint or a different mechanism that would be able to do this? Thanks a lot for the help mate.berkeman said:Great, thanks. That helps a lot.
So just a hinge or ball joint won't work for attaching the actuator to the stand? Do you need to assist the angular motion of the actuator at the hinge?
In the ideal model of it, the actuator would move left and right under the horizontal forces acting at the bottom of it without any horizontal resistance (I want it to move horizontally as it would if there was no stand i.e. was floating in mid-air). As this isn't possible, I'm trying to get as close to this model as I canberkeman said:So you want the vertical linear actuator to be able to resist horizontal forces down at the bottom of it, without having binding issues, right?
Can't quite wrap my head around this ideaberkeman said:alternately, extend the actuator horizontally into a plate or structure, and use two linear actuators along the left and right edges of the plate/structure to drive it up and down.
In the original design the rod of the actuator (the lower part of it) just retracts into the housing (the upper segment of it). Would it be beneficial if it could extend above the stand?berkeman said:Can the actuator mechanism extend above the horizontal stand piece at the top as the actuator retracts?
I think I'm starting to understand. You want the horizontal forces at the bottom point to move the vertical linear actuator left and right with as little resistance and deformation as possible, right?Neekman99 said:In the ideal model of it, the actuator would move left and right under the horizontal forces acting at the bottom of it without any horizontal resistance (I want it to move horizontally as it would if there was no stand i.e. was floating in mid-air).
berkeman said:I think one way to do this would be to use two coordinated linear actuators that form a "V" shape, joining at the bottom and with their top ends separate by some distance. Use hinges at their tops to allow their angles to vary from maximum when retracted to minimum when fully extended. The top part of the "V" would be a crossbar that is on a horizontal roller track attached to the top horizontal part of your stand to allow the whole thing to move left and right due to the horizontal forces applied at the bottom joining joint of the "V"
jrmichler said:the actuator should be inside some sort of telescoping structure that is designed to handle sideways force
Baluncore said:You could have a bed made from a plate resting on bearing balls that will allow the work piece to move sideways and so remain under the press. There are x-y rail systems that could be used to allow horizontal freedom.
Baluncore said:You would find better stability if you mounted the linear actuator by the bottom of it's outer tube rather than at the highest point. That would also reduce the the required support column length and flexibility.
Baluncore said:There are x-y rail systems that could be used to allow horizontal freedo
Tom.G said:The top of the actuator could ride on a trolley. Think of the wheel trucks on railroad cars. That approach is used in Gantry Cranes and Boom Cranes.
A Google search finds over 7 000 000 entries: https://www.google.com/search?q=gantry+crane
There is also a slide show at: http://www100.abb.com/Drives_DE/dcs...1/data/downloads/crane drive basics r0101.pdf
Since you also have an upward force, you would need additional wheels below the boom (horizontal section of your sketch).
A linear actuator is a type of mechanical device that converts rotational motion into linear motion. It typically consists of a motor, a lead screw, and a nut that moves along the screw as it rotates. This motion can be used to push or pull objects in a straight line.
A linear actuator works by using a motor to rotate a lead screw, which in turn moves a nut along the screw. This motion is then transferred to a rod or other mechanism attached to the nut, causing it to move in a straight line. The direction and speed of the motion can be controlled by the motor.
Linear actuators offer several advantages, including precise and controllable linear motion, compact size, and high force output. They also have a long lifespan and require minimal maintenance.
Linear actuators are used in a wide range of industries and applications, including robotics, automotive engineering, medical equipment, and home automation. They are commonly used to move and position objects, open and close doors or windows, and control valves and other mechanisms.
When choosing a linear actuator, it is important to consider factors such as the required force and speed, the size and weight of the load, and the available space for installation. It is also important to choose a reputable manufacturer and ensure that the actuator is compatible with your power source and control system.